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来源: www.econlib.org/library/Malthus/malPlong.html, www.bl.uk/collection-items/an-essay-on-the-principle-of-population, www.jstor.org/stable/economics-population, www.newworldencyclopedia.org/entry/Thomas_Robert_Malthus, www.ucl.ac.uk/lbs/person/view/2146648541 (UCL Legacies of British Slavery), www.nobelprize.org/prizes/peace/1970/borlaug/biographical, www.imf.org/external/pubs/ft/wp/2003/wp03277.pdf, www.stanford.edu/dept/soc/demography/Malthus, www.populationeducation.org/content/malthusian-theory-population